Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 21,159	$ 19,838
Restricted cash, current portion	1,444	1,856
Accounts receivable	4,543	2,347
Inventories, net	7,996	9,064
Deferred cost of product revenues, including deferred cost of product revenues to related parties of $0 and $79 as of June 30, 2016 and December 31, 2015, respectively	2,026	1,596
Prepaid expenses and other current assets	641	1,211
Total current assets	37,809	35,912
Property, plant and equipment, net	18,522	18,445
Restricted cash, less current portion	1,560	16,560
Other assets	279	284
Total assets	58,170	71,201
Current liabilities:
Accounts payable	2,227	2,007
Accrued liabilities	4,302	5,689
Accrued interest due to related parties	1,600	1,175
Deferred revenue, current portion	4,551	2,919
Deferred revenue from related parties		168
Capital lease obligations, current portion	829	647
Debt, current portion	244	244
Total current liabilities	13,753	12,849
Deferred revenue, less current portion	1,838	2,021
Capital lease obligations, less current portion	486	18
Debt, less current portion	21,403	21,509
Debt due to related parties	36,086	35,512
Other liabilities	1,342	1,314
Total liabilities	74,908	73,223
Commitments and contingencies (Note 8)
Stockholders' deficit:
Common stock: $0.00001 par value; 250,000 shares authorized, 24,620 shares issued and outstanding as of June 30, 2016 and 24,536 as of December 31, 2015	0	0
Additional paid in capital	202,897	201,554
Accumulated deficit	(219,635)	(203,576)
Total stockholders' deficit	(16,738)	(2,022)
Total liabilities and stockholders' deficit	$ 58,170	$ 71,201