Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 5,416	$ 20,583
Short-term investments	51,724	53,453
Accounts receivable, net	16,728	22,193
Inventory	14,544	13,812
Prepaid expenses and other	3,953	3,744
Total current assets	92,365	113,785
Restricted cash	143	143
Property and equipment, net	13,657	12,158
Other assets	368	287
Total assets	106,533	126,373
Current liabilities:
Accounts payable	2,145	4,935
Accrued liabilities	9,117	12,344
Deferred revenue, current portion	20,798	19,033
Deferred rent, current portion	337	13
Lease financing obligations, current portion	26	58
Total current liabilities	32,423	36,383
Deferred revenue, net of current portion	20,656	22,664
Deferred rent and other long-term liabilities	8,763	7,655
Long-term debt and lease financing obligations, net of current portion and debt issuance costs	47,748	47,366
Total liabilities	109,590	114,068
Commitment and contingencies
Stockholders’ equity (deficit):
Preferred stock, $0.0001 par value, 15,000 shares authorized; none issued	0	0
Common stock, $0.0001 par value, 150,000 shares authorized; 21,684 and 21,528 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	2	2
Additional paid-in capital	285,381	281,900
Accumulated other comprehensive loss	(48)	(57)
Accumulated deficit	(288,392)	(269,540)
Total stockholders’ equity (deficit)	(3,057)	12,305
Total liabilities and stockholders’ equity (deficit)	$ 106,533	$ 126,373