CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 14,432	$ 10,121
Accounts receivable, net	15,623	12,889
Inventory	19,228	11,837
Prepaid expenses and other current assets	1,142	1,095
Total current assets	50,425	35,942
Property and equipment, net	12,621	12,351
Other non-current assets	1,528	637
Goodwill	3,881	3,881
Other intangible assets, net		37
Total assets	68,455	52,848
Current liabilities:
Accounts payable	7,473	3,182
Accrued compensation and employee related benefits	4,006	4,038
Accrued liabilities	4,225	2,895
Current portion of long-term debt	13,162	5,227
Current portion of capital lease obligations	1,100	1,190
Current portion of deferred rent	182	258
Current portion of deferred revenue	371	684
Total current liabilities	30,519	17,474
Long-term debt, net of current portion	15,033	10,683
Capital lease obligations, net of current portion	2,115	2,526
Long-term liabilities—other	724	678
Warrant liability	2,711	2,865
Deferred rent, net of current portion	5,104	4,984
Deferred revenue, net of current portion	970	710
Total liabilities	57,176	39,920
Commitment and contingencies
Total redeemable convertible preferred stock	103,731	97,963
Stockholders' deficit:
Common stock, $0.001 par value, 17,083 shares authorized; 4,478 and 4,382 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	4	4
Additional paid in capital	95,443	100,276
Accumulated deficit	(187,899)	(185,315)
Total stockholders' deficit	(92,452)	(85,035)
Total liabilities, redeemable convertible preferred stock and stockholders' deficit	68,455	52,848
Series 1
Current liabilities:
Total redeemable convertible preferred stock	65,834	60,184
Series 2
Current liabilities:
Total redeemable convertible preferred stock	$ 37,897	$ 37,779