Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 10,468	$ 21,856
Short-term investments	43,116	27,188
Accounts receivable, net	21,041	19,725
Inventory	11,730	10,138
Prepaid expenses and other	4,385	3,886
Total current assets	90,740	82,793
Restricted cash	143	143
Deferred offering costs	229	181
Property and equipment, net	10,705	9,414
Other assets	440	338
Total assets	102,257	92,869
Current liabilities:
Accounts payable	2,127	3,243
Accrued liabilities	9,917	12,181
Deferred revenue, current portion	16,748	5,261
Deferred rent, current portion	5	0
Lease financing obligations, current portion	92	226
Total current liabilities	28,889	20,911
Deferred revenue, net of current portion	26,752	6,486
Deferred rent and other long-term liabilities	6,192	4,257
Long-term debt and lease financing obligations, net of current portion and debt issuance costs	46,980	41,000
Total liabilities	108,813	72,654
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; 19,928 and 19,570 shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively	2	2
Additional paid-in capital	251,399	242,693
Accumulated other comprehensive income (loss)	(10)	(29)
Accumulated deficit	(257,947)	(222,451)
Total stockholders’ equity (deficit)	(6,556)	20,215
Total liabilities and stockholders’ equity (deficit)	$ 102,257	$ 92,869