Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 69,482	$ 6,030
Marketable securities	139,518	172,932
Interest receivable	307	423
Accounts receivable	2,521	10,368
Prepaid expenses	754	623
Restricted cash		320
Other current assets		183
Total current assets	212,582	190,879
Marketable securities, non-current		47,260
Property and equipment, net	2,916	1,479
Goodwill and intangible assets, net	1,585	3,455
Other assets	152	139
Total assets	217,235	243,212
Current liabilities:
Accounts payable and accrued liabilities	8,229	8,704
Accrued compensation and employee benefits	2,748	2,853
Escrow liability		275
Deferred revenues	9,120	9,050
Total current liabilities	20,097	20,882
Deferred revenues, non-current	4,699	13,149
Contingent consideration liability		1,800
Deferred tax liability		748
Total liabilities	$ 24,796	$ 36,579
Commitments and contingencies
Stockholders' equity:
Common stock, $0.01 par value; 160,000,000 shares authorized, 70,354,608 and 69,062,394 shares issued and outstanding at December 31, 2015, and December 31, 2014, respectively	$ 703	$ 690
Additional paid-in capital	560,989	534,518
Accumulated deficit	(369,253)	(328,550)
Accumulated other comprehensive income (loss)		(25)
Total stockholders' equity	192,439	206,633
Total liabilities and stockholders' equity	$ 217,235	$ 243,212