CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 71,843	$ 60,333
Marketable securities	25,145	16,364
Accounts receivable, net of allowance for doubtful accounts of $719 and $388 at September 30, 2018 and December 31, 2017, respectively	40,697	28,800
Deferred commissions	5,887	2,376
Other receivables	1,392	975
Prepaid expenses	5,727	6,444
Total current assets	150,691	115,292
Property and equipment, net	39,759	40,444
Deferred commissions, non-current	7,368	0
Intangible assets, net	1,216	1,118
Other assets	1,414	861
Total assets	200,448	157,715
Current liabilities
Accounts payable	5,053	3,060
Accrued expenses and other current liabilities	34,146	20,212
Deferred revenue	128,435	104,684
Deferred government grant obligation	228	217
Current portion of capital lease and financing obligations	1,181	1,168
Total current liabilities	169,043	129,341
Deferred revenue, non-current	20,650	22,709
Deferred government grant obligation	81	278
Other long-term liabilities	5,428	3,896
Capital lease and financing obligations	17,533	18,425
Total liabilities	212,735	174,649
Stockholders’ deficit
Preferred stock, $0.001 par value per share, 100,000,000 shares authorized, no shares issued and outstanding	0	0
Additional paid-in-capital	286,888	248,289
Accumulated deficit	(299,306)	(265,337)
Accumulated other comprehensive income	87	72
Total stockholders’ deficit	(12,287)	(16,934)
Total liabilities and stockholders’ deficit	200,448	157,715
Class A Common Stock
Stockholders’ deficit
Common stock	34	32
Class B Common Stock
Stockholders’ deficit
Common stock	$ 10	$ 10