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Prior-Period Financial Statements - Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Current assets      
Cash and cash equivalents $ 34,996 $ 16,528  
Marketable securities 236,605 207,603  
Accounts receivable 2,462 1,142  
Prepaid expenses and other current assets 12,095 5,606  
Total current assets 286,920 230,879  
Property and equipment, net 9,688 7,088  
Patents, licenses, and other intangible assets, net 11,677 11,148  
Marketable securities - long term 276,228 139,198  
Income tax receivable 762 1,524  
Loan receivable   86  
Interest receivable   14  
Other assets 311 265  
Total assets 585,586 390,202  
Current liabilities      
Accounts payable 5,983 6,869  
Accrued expenses 5,671 5,480  
Current portion of deferred rent 294 26  
Current portion of deferred revenue 40,079 60,118  
Income taxes   157  
Total current liabilities 52,027 72,650  
Deferred rent, less current portion 1,286 1,088  
Total liabilities 53,313 73,738  
Commitments and contingencies  
Preferred stock, $0.01 par value: 10,000,000 authorized shares; -0- issued and outstanding shares at December 31, 2017  
Common stock, $0.01 par value: 200,000,000 authorized shares at December 31, 2017; 47,002,488 issued and outstanding at December 31, 2017 562 470  
Additional paid-in capital 839,127 570,670  
Accumulated other comprehensive loss (2,338) (1,808)  
Accumulated deficit (305,078) (252,868)  
Stockholders' equity 532,273 316,464  
Total liabilities and stockholders' equity $ 585,586 390,202  
As Reported Before ASC Topic 606      
Current liabilities      
Stockholders' equity   306,025 $ 337,933
ASU 2014-09 | As Reported Before ASC Topic 606      
Current assets      
Cash and cash equivalents   16,528  
Marketable securities   207,603  
Accounts receivable   1,142  
Prepaid expenses and other current assets   5,606  
Total current assets   230,879  
Property and equipment, net   7,088  
Patents, licenses, and other intangible assets, net   11,148  
Marketable securities - long term   139,198  
Income tax receivable   1,524  
Other assets   265  
Total assets   390,102  
Current liabilities      
Accounts payable   6,869  
Accrued expenses   5,480  
Current portion of deferred rent   26  
Current portion of deferred revenue   88,813  
Income taxes   157  
Total current liabilities   101,345  
Deferred rent, less current portion   1,088  
Deferred revenue, less current portion   5,623  
Total liabilities   108,056  
Common stock, $0.01 par value: 200,000,000 authorized shares at December 31, 2017; 47,002,488 issued and outstanding at December 31, 2017   470  
Additional paid-in capital   570,670  
Accumulated other comprehensive loss   (1,808)  
Accumulated deficit   (287,286)  
Stockholders' equity   282,046  
Total liabilities and stockholders' equity   390,102  
ASU 2014-09 | Effect of Adoption of ASC Topic 606      
Current assets      
Loan receivable   86  
Interest receivable   14  
Total assets   100  
Current liabilities      
Current portion of deferred revenue   (28,695)  
Total current liabilities   (28,695)  
Deferred revenue, less current portion   (5,623)  
Total liabilities   (34,318)  
Accumulated deficit   34,418  
Stockholders' equity   34,418  
Total liabilities and stockholders' equity   $ 100