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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 67,745 $ 75,383 [1]
Short-term investments 59,704 58,593 [1]
Accounts receivable [1]   10,796
Unbilled license revenue 5,000  
Prepaid expenses and other current assets 2,871 4,940 [1]
Total current assets 135,320 149,712 [1]
Property and equipment, net 7,358 8,032 [1]
Other assets 159 159 [1]
Total assets 142,837 157,903 [1]
Current liabilities:    
Accounts payable 1,761 3,933 [1]
Accrued compensation and benefits 1,617 3,229 [1]
Uncharged license fees 1,000  
Accrued and other liabilities 8,784 10,709 [1]
Total current liabilities 13,162 17,871 [1]
Other long-term liabilities 699 720 [1]
Total liabilities 13,861 18,591 [1]
Commitments and contingencies [1]
Stockholders' equity:    
Preferred stock, $0.0001 par value; 5,000,000 shares authorized; no shares issued and outstanding as of March 31, 2018 and December 31, 2017, respectively. [1]
Common stock, $0.0001 par value; 300,000,000 shares authorized; 47,603,568 and 47,534,979 shares issued and outstanding as of March 31, 2018 and December 31, 2017, respectively. 5 5 [1]
Additional paid-in capital 420,294 417,568 [1]
Accumulated deficit (291,232) (278,214) [1]
Accumulated other comprehensive loss (91) (47) [1]
Total stockholders' equity 128,976 139,312 [1]
Total liabilities and stockholders' equity $ 142,837 $ 157,903 [1]
[1] Derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10K for the year ended December 31, 2017.