Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 42,007	$ 17,256
Short-term investments	36,741	6,260
Accounts receivable, net of allowance for doubtful accounts of $569 and $289	58,587	52,887
Prepaid expenses and other current assets	5,440	3,990
Total current assets	142,775	80,393
Long-term assets
Property and equipment, net of accumulated depreciation of $17,091 and $12,774	12,827	13,487
Long-term investments	38,446	0
Restricted cash	0	2,500
Deferred initial public offering costs		1,973
Other long-term assets	734	798
Total assets	194,782	99,151
Current liabilities
Accounts payable	3,574	3,462
Accrued payroll and other expenses	14,073	14,732
Deferred revenue	97,885	82,422
Deferred rent	799	613
Capital leases	43	42
Total current liabilities	116,374	101,271
Long-term liabilities
Deferred revenue, net of current portion	2,254	803
Deferred rent, net of current portion	4,360	4,810
Capital leases, net of current portion	51	95
Preferred stock warrant liability		414
Asset retirement obligation	175	210
Total liabilities	123,214	107,603
Commitments and contingencies (Note 11)
Convertible preferred stock		133,809
Stockholders’ equity (deficit)
Class A and Class B Common stock	4	1
Additional paid-in capital	271,982	26,509
Accumulated other comprehensive loss	(94)
Accumulated deficit	(200,324)	(168,771)
Total stockholders’ equity (deficit)	71,568	(142,261)
Total liabilities, convertible preferred stock and stockholders' equity (deficit)	$ 194,782	$ 99,151