Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 111,712	$ 17,256
Short-term investments	10,818	6,260
Accounts receivable, net of allowance for doubtful accounts of $215 and $289	42,585	52,887
Prepaid expenses and other current assets	5,249	3,990
Total current assets	170,364	80,393
Long-term assets
Property and equipment, net of accumulated depreciation of $15,703 and $12,774	13,058	13,487
Restricted cash		2,500
Deferred initial public offering costs		1,973
Other long-term assets	616	798
Total assets	184,038	99,151
Current liabilities
Accounts payable	6,375	3,462
Accrued payroll and other expenses	12,456	14,732
Deferred revenue	81,415	82,422
Deferred rent	784	613
Capital leases	42	42
Total current liabilities	101,072	101,271
Long-term liabilities
Deferred revenue, net of current portion	2,346	803
Deferred rent, net of current portion	4,540	4,810
Capital leases, net of current portion	62	95
Preferred stock warrant liability		414
Asset retirement obligation	184	210
Total liabilities	108,204	107,603
Commitments and contingencies (Note 9)
Convertible preferred stock		133,809
Stockholders’ equity (deficit)
Class A and Class B Common stock	4	1
Additional paid-in capital	268,240	26,509
Accumulated other comprehensive loss	(3)
Accumulated deficit	(192,407)	(168,771)
Total stockholders’ equity (deficit)	75,834	(142,261)
Total liabilities, convertible preferred stock and stockholders' equity (deficit)	$ 184,038	$ 99,151