CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 23,543	$ 28,859
Short-term investments	72,659	88,718
Accounts receivable	13,432	8,752
Inventories	17,447	13,539
Prepaid and other current assets	8,756	7,034
Total current assets	135,837	146,902
Non-current assets:
Property and equipment, net	15,345	8,130
Goodwill	1,316	1,316
Operating lease right-of-use assets	14,417
Intangible assets, net	233	334
Restricted cash	2,677	2,728
Other assets	4,802	4,050
Total assets	174,627	163,460
Current liabilities:
Accounts payable	21,058	18,595
Accrued liabilities	16,654	19,800
Manufacturing and development obligations	6,198	5,928
Debt – revolving loan	4,496
Debt – term loan		7,857
Operating lease liabilities – current	1,711
Deferred product revenue – current	665	498
Total current liabilities	50,782	52,678
Non-current liabilities:
Debt – non-current	39,327	22,013
Operating lease liabilities – non-current	18,722
Other non-current liabilities	164	4,250
Total liabilities	108,995	78,941
Commitments and contingencies
Stockholders' equity:
Common stock	140	136
Additional paid-in capital	880,622	863,531
Accumulated other comprehensive income (loss)	91	(281)
Accumulated deficit	(815,221)	(778,867)
Total stockholders' equity	65,632	84,519
Total liabilities and stockholders' equity	$ 174,627	$ 163,460