Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 93,405	$ 34,675
Accounts receivable, net of allowance for doubtful accounts of $90 and $79 as of December 31, 2015 and 2014	6,643	3,193
Prepaid expenses and other current assets	3,082	2,562
Total current assets	103,130	40,430
Property and equipment, net	31,754	28,568
Intangible assets, net	636	60
Goodwill	5,396	1,827
Other noncurrent assets	498	2,166
TOTAL ASSETS	141,414	73,051
Current liabilities:
Accounts payable	4,426	5,406
Accrued expenses and other liabilities	7,911	5,219
Deferred revenue, current portion	3,367	2,396
Other current liabilities	645	447
Total current liabilities	16,349	13,468
Deferred revenue, noncurrent portion	1,886	360
Deferred rent, noncurrent portion	1,254	988
Financing obligation on leases, noncurrent portion	15,961	15,496
Preferred stock warrant		1,188
Other noncurrent liabilities	181	28
Total liabilities	$ 35,631	$ 31,528
Commitments and contingencies (Note 7)
Redeemable convertible preferred stock, par value of $0.000004 per share; no shares authorized, issued and outstanding as of December 31, 2015; 20,542,012 shares authorized, 20,454,489 shares issued and outstanding as of December 31, 2014; aggregate liquidation preference of $117,636 as of December 31, 2014		$ 166,448
Stockholders' equity (deficit):
Additional paid-in capital	$ 270,436
Accumulated other comprehensive loss	(271)	(132)
Accumulated deficit	(164,382)	(124,793)
Total stockholders' equity (deficit)	105,783	(124,925)
TOTAL LIABILITIES, REDEEMABLE CONVERTIBLE PREFERRED STOCK, AND STOCKHOLDERS' EQUITY (DEFICIT)	$ 141,414	$ 73,051