Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 103,633	$ 103,051
Short-term investments	48,499	42,908
Accounts receivable, net	22,393	31,699
Prepaid expenses	4,214	2,563
Other current assets	3,079	811
Total current assets	186,856	183,461
Deferred costs	5,038	2,429
Property and equipment, net	2,481	2,796
Capitalized software development costs, net	10,755	10,005
Goodwill	31,077	31,328
Intangible assets, net	7,952	8,634
Deferred costs	7,478
Other assets	247	189
Total assets	246,846	236,413
Current liabilities:
Accounts payable	3,029	2,446
Accrued payroll and employee related liabilities	15,513	11,111
Accrued expenses	3,209	1,825
Deferred revenue	68,514	70,090
Contingent liabilities	674	682
Other current liabilities	1,331	808
Total current liabilities	92,270	86,962
Long-term liabilities:
Deferred revenue, noncurrent	2,486	2,982
Convertible senior notes	90,615	89,481
Deferred tax liabilities	512	482
Other long term liabilities	465	515
Total liabilities	186,348	180,422
Commitments and contingencies
Stockholders' equity:
Preferred stock, par value $0.001, 10,000,000 shares authorized, no shares issued or outstanding as of March 31, 2018 and December 31, 2017, respectively
Common stock, $0.001 par value, 100,000,000 shares authorized, 28,723,250 and 28,330,460 shares issued and outstanding as of March 31, 2018 and December 31, 2017, respectively	29	28
Additional paid-in capital	173,013	164,995
Accumulated deficit	(112,497)	(109,252)
Accumulated other comprehensive income (loss)	(47)	220
Total stockholders’ equity	60,498	55,991
Total liabilities and stockholders’ equity	$ 246,846	$ 236,413