CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 34,986	$ 28,859
Short-term investments	50,732	88,718
Accounts receivable	16,882	8,752
Inventories	19,490	13,539
Prepaid and other current assets	6,018	7,034
Total current assets	128,108	146,902
Non-current assets:
Property and equipment, net	14,898	8,130
Goodwill	1,316	1,316
Operating lease right-of-use assets	14,122
Intangible assets, net	132	334
Restricted cash	2,435	2,728
Other assets	4,524	4,050
Total assets	165,535	163,460
Current liabilities:
Accounts payable	22,185	18,595
Accrued liabilities	20,951	19,800
Manufacturing and development obligations		5,928
Debt – current	5,017	7,857
Operating lease liabilities – current	1,613
Deferred product revenue – current	570	498
Total current liabilities	50,336	52,678
Non-current liabilities:
Debt – non-current	39,414	22,013
Operating lease liabilities – non-current	18,406
Other non-current liabilities	327	4,250
Total liabilities	108,483	78,941
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000 shares authorized, issuable in series; zero shares issued and outstanding at December 31, 2019 and 2018, respectively
Common stock, $0.001 par value; 225,000 shares authorized; 144,291 and 136,853 shares issued and outstanding at December 31, 2019 and 2018, respectively	144	136
Additional paid-in capital	906,905	863,531
Accumulated other comprehensive income (loss)	114	(281)
Accumulated deficit	(850,111)	(778,867)
Total stockholders' equity	57,052	84,519
Total liabilities and stockholders' equity	$ 165,535	$ 163,460