Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 32,810	$ 31,344
Accounts receivable, net	12,080	8,663
Prepaid expenses and other current assets	3,693	2,741
Total current assets	48,583	42,748
Property and equipment, net	12,494	11,665
Intangible assets, net	15,397	10,431
Goodwill	18,954	17,152
Other assets	1,032	1,246
Total assets	96,460	83,242
Current liabilities
Accounts payable	2,036	1,980
Accrued expenses and other current liabilities	19,133	17,182
Deferred revenue	3,204	2,064
Total current liabilities	24,373	21,226
Deferred tax liability	58	40
Other liabilities	2,321	3,456
Total Liabilities	26,752	24,722
Commitments and contingencies (Note 7)
Stockholders' equity
Common stock, $0.0001 par value. Authorized 100,000 shares; 26,920 and 25,265 shares issued and outstanding at September 30, 2018 and 22,686 and 21,031 shares issued and outstanding at December 31, 2017	2	2
Additional paid-in capital	552,452	523,012
Treasury stock at cost, 1,655 shares at September 30, 2018 and December 31, 2017	(35,706)	(35,706)
Accumulated other comprehensive loss	(16)	(17)
Accumulated deficit	(447,024)	(428,771)
Total stockholders' equity	69,708	58,520
Total liabilities and stockholders' equity	$ 96,460	$ 83,242