Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 19,294	$ 21,856
Short-term investments	37,846	27,188
Accounts receivable, net	25,238	19,725
Inventory	12,510	10,138
Prepaid expenses and other	3,599	3,886
Total current assets	98,487	82,793
Restricted cash	143	143
Deferred offering costs	178	181
Property and equipment, net	10,646	9,414
Other assets	420	338
Total assets	109,874	92,869
Current liabilities:
Accounts payable	3,973	3,243
Accrued liabilities	8,738	12,181
Deferred revenue, current portion	16,873	5,261
Deferred rent, current portion	172	0
Lease financing obligations, current portion	149	226
Total current liabilities	29,905	20,911
Deferred revenue, net of current portion	27,188	6,486
Deferred rent and other long-term liabilities	5,853	4,257
Long-term debt and lease financing obligations, net of current portion and debt issuance costs	46,596	41,000
Total liabilities	109,542	72,654
Commitment and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value, 15,000 shares authorized; none issued	0	0
Common stock, $0.0001 par value, 150,000 shares authorized; 19,834 and 19,570 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	2	2
Additional paid-in capital	248,162	242,693
Accumulated other comprehensive income (loss)	27	(29)
Accumulated deficit	(247,859)	(222,451)
Total stockholders’ equity	332	20,215
Total liabilities and stockholders’ equity	$ 109,874	$ 92,869