{"cik":"0001326730","entityType":"other","sic":"3845","sicDescription":"Electromedical & Electrotherapeutic Apparatus","ownerOrg":null,"insiderTransactionForOwnerExists":0,"insiderTransactionForIssuerExists":0,"name":"Mevion Medical Systems, Inc.","tickers":[],"exchanges":[],"ein":"000000000","lei":null,"description":"","website":"","investorWebsite":"","category":"","fiscalYearEnd":null,"stateOfIncorporation":"DE","stateOfIncorporationDescription":"DE","addresses":{"mailing":{"street1":"300 FOSTER ST","street2":null,"city":"LITTLETON","stateOrCountry":"MA","zipCode":"01460","stateOrCountryDescription":"MA","isForeignLocation":null,"foreignStateTerritory":null,"country":null,"countryCode":null},"business":{"street1":"300 FOSTER ST","street2":null,"city":"LITTLETON","stateOrCountry":"MA","zipCode":"01460","stateOrCountryDescription":"MA","isForeignLocation":null,"foreignStateTerritory":null,"country":null,"countryCode":null}},"phone":"978-486-1006","flags":"","formerNames":[{"name":"Still River Systems Inc","from":"2005-05-06T00:00:00.000Z","to":"2011-03-18T00:00:00.000Z"}],"filings":{"recent":{"accessionNumber":["0001326730-15-000001","0001193125-15-269750","0001193125-14-369219","0001193125-14-357386","0001193125-14-339250","0000950123-14-007391","0000950123-14-006709","0001326730-12-000002","0001326730-11-000002","9999999997-09-010597","9999999997-08-017362","9999999997-07-043124","9999999997-06-018666","9999999997-05-048594","9999999997-05-023204"],"filingDate":["2015-08-11","2015-07-30","2014-10-10","2014-09-29","2014-09-11","2014-07-24","2014-06-11","2012-01-25","2011-03-18","2009-03-11","2008-03-28","2007-09-24","2006-04-26","2005-12-07","2005-05-06"],"reportDate":["","","","","","","","","","","","","","",""],"acceptanceDateTime":["2015-08-11T16:01:15.000Z","2015-07-30T14:35:36.000Z","2014-10-10T20:45:45.000Z","2014-09-29T21:23:47.000Z","2014-09-11T21:15:13.000Z","2014-07-24T20:30:54.000Z","2014-06-11T00:22:36.000Z","2012-01-25T18:34:43.000Z","2011-03-18T14:19:47.000Z","2009-03-24T21:30:39.000Z","2008-04-03T13:22:26.000Z","2007-10-04T20:16:59.000Z","2006-05-08T18:01:01.000Z","2005-12-09T16:38:48.000Z","2005-05-12T14:58:59.000Z"],"act":["33","NE","33","33","33","33","33","33","33","34","34","34","34","34","34"],"form":["D","RW","S-1/A","S-1/A","S-1","DRS/A","DRS","D","D","REGDEX","REGDEX","REGDEX","REGDEX","REGDEX/A","REGDEX"],"fileNumber":["021-245473","333-198690","333-198690","333-198690","333-198690","377-00650","377-00650","021-172421","021-156983","021-76930","021-76930","021-76930","021-76930","021-76930","021-76930"],"filmNumber":["151043114","151014853","141152830","141127737","141098743","14991654","14903356","12544119","11697079","09035838","08044944","07077496","06034513","05073711","05054313"],"items":["06b","","","","","","","06","06","06","06","06","06","06","06"],"core_type":["D","RW","S-1/A","S-1/A","S-1","DRS/A","DRS","D","D","REGDEX","REGDEX","REGDEX","REGDEX","REGDEX/A","REGDEX"],"size":[14197,8143,3008541,3281867,5143135,2281870,2268156,12500,11972,1570,1562,1562,1562,1568,1562],"isXBRL":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"isInlineXBRL":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"isXBRLNumeric":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"primaryDocument":["xslFormDX01/primary_doc.xml","d730478drw.htm","d730478ds1a.htm","d730478ds1a.htm","d730478ds1.htm","filename1.htm","filename1.htm","xslFormDX01/primary_doc.xml","xslFormDX01/primary_doc.xml","9999999997-09-010597.paper","9999999997-08-017362.paper","9999999997-07-043124.paper","9999999997-06-018666.paper","9999999997-05-048594.paper","9999999997-05-023204.paper"],"primaryDocDescription":["","RW","S-1/A","AMENDMENT NO.1 TO FORM S-1","S-1","","","","","AUTO-GENERATED PAPER DOCUMENT","AUTO-GENERATED PAPER DOCUMENT","AUTO-GENERATED PAPER DOCUMENT","AUTO-GENERATED PAPER DOCUMENT","AUTO-GENERATED PAPER DOCUMENT","AUTO-GENERATED PAPER DOCUMENT"]},"files":[]}}