Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 91,451	$ 93,405
Accounts receivable, net of allowance for doubtful accounts of $163 and $90 as of March 31, 2016 and December 31, 2015	7,854	6,643
Prepaid expenses and other current assets	3,286	3,082
Total current assets	102,591	103,130
Property and equipment, net	33,509	31,754
Intangible assets, net	560	636
Goodwill	5,396	5,396
Other noncurrent assets	507	498
TOTAL ASSETS	142,563	141,414
Current liabilities:
Accounts payable	6,449	4,426
Accrued expenses and other liabilities	9,038	7,911
Deferred revenue, current portion	3,687	3,367
Other current liabilities	658	645
Total current liabilities	19,832	16,349
Deferred revenue, noncurrent portion	2,275	1,886
Deferred rent, noncurrent portion	1,298	1,254
Financing obligation on leases, noncurrent portion	15,861	15,961
Other noncurrent liabilities	166	181
Total liabilities	$ 39,432	$ 35,631
Commitments and contingencies (Note 7)
Stockholders' equity:
Additional paid-in capital	$ 274,330	$ 270,436
Accumulated other comprehensive loss	(223)	(271)
Accumulated deficit	(170,976)	(164,382)
Total stockholders' equity	103,131	105,783
TOTAL LIABILITIES, REDEEMABLE CONVERTIBLE PREFERRED STOCK, AND STOCKHOLDERS' EQUITY	$ 142,563	$ 141,414