Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 235,256	$ 59,978
Restricted cash	93	90
Short-term investments	22,955	45,541
Accounts receivable, net	35,416	41,107
Prepaid expenses	9,123	4,890
Deferred costs	6,822	6,503
Other current assets	2,771	4,406
Total current assets	312,436	162,515
Property and equipment, net	5,977	4,650
Capitalized software development costs, net	13,442	12,893
Goodwill	48,395	48,382
Intangible assets, net	21,577	23,197
Deferred costs	10,575	10,265
Other assets	14,221	278
Total assets	426,623	262,180
Current liabilities:
Accounts payable	5,927	2,719
Accrued payroll and employee related liabilities	18,313	17,108
Accrued expenses	4,500	5,565
Deferred revenue	95,325	92,738
Note payable	367	427
Other current liabilities	4,829	1,490
Total current liabilities	129,261	120,047
Long-term liabilities:
Deferred revenue, noncurrent	3,078	2,898
Convertible senior notes	95,298	94,097
Deferred tax liabilities	1,057	1,032
Other long term liabilities	13,499	1,948
Total liabilities	242,193	220,022
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, 2019 and December 31, 2018, respectively
Common stock, $0.001 par value, 100,000,000 shares authorized, 32,882,089 and 29,700,192 shares issued and outstanding as of March 31, 2019 and December 31, 2018, respectively	33	30
Additional paid-in capital	351,247	194,866
Accumulated deficit	(161,804)	(147,670)
Accumulated other comprehensive loss	(5,046)	(5,068)
Total stockholders’ equity	184,430	42,158
Total liabilities and stockholders’ equity	$ 426,623	$ 262,180