Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 31,344	$ 50,864
Accounts receivable, net	8,663	6,849
Prepaid expenses and other current assets	2,741	8,139
Total current assets	42,748	65,852
Property and equipment, net	11,665	11,503
Intangible assets, net	10,431	11,273
Goodwill	17,152	11,167
Other assets	1,246	1,457
Total assets	83,242	101,252
Current liabilities
Accounts payable	1,980	2,451
Accrued expenses and other current liabilities	17,182	15,017
Deferred revenue	2,064	2,180
Total current liabilities	21,226	19,648
Deferred tax liability	40	108
Other liabilities	3,456	1,746
Total Liabilities	24,722	21,502
Commitments and contingencies (Note 8)
Stockholders' equity
Common stock, $0.0001 par value. Authorized 100,000 shares; 22,686 issued and 21,031 shares outstanding at December 31, 2017 and 21,407 issued and 19,763 shares outstanding at December 31, 2016	2	2
Additional paid-in capital	523,012	513,139
Treasury stock at cost, 1,655 at December 31, 2017 and 1,644 at December 31, 2016	(35,706)	(35,641)
Accumulated other comprehensive loss	(17)	(112)
Accumulated deficit	(428,771)	(397,638)
Total stockholders' equity	58,520	79,750
Total liabilities and stockholders' equity	$ 83,242	$ 101,252