Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 21,518	$ 26,394
Accounts receivable, net	8,163	11,066
Royalty receivable	150	165
Inventories, net	11,857	12,074
Prepaid expenses and other current assets	1,863	2,815
Total current assets	43,551	52,514
Property and equipment, net	13,756	13,356
Operating lease right-of-use assets	5,565	5,853
Other Assets
Restricted cash	462	462
Other long-term assets	200	211
Total assets	63,534	72,396
Current liabilities
Accounts payable	6,191	6,920
Accrued expenses	6,285	7,135
Operating lease liabilities	1,479	1,469
Advance on research and development	2,020	2,331
Total current liabilities	15,975	17,855
Other long-term liabilities	1,500	1,500
Contract liability		12,000
Long-term debt, less debt issuance costs	19,787	19,623
Operating lease liabilities	4,757	5,071
Total liabilities	54,019	56,049
Commitments and contingencies
Stockholders’ equity
Preferred stock, $0.00001 par value: Authorized: 5,000,000 shares authorized as of March 31, 2020 and December 31, 2019; no shares issued and outstanding as of March 31, 2020 and December 31, 2019	0	0
Common stock, $0.00001 par value: Authorized: 200,000,000 shares authorized as of March 31, 2020 and December 31, 2019; 71,505,724 and 70,427,400 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	1	1
Additional paid-in capital	523,265	521,356
Accumulated deficit	(513,498)	(504,145)
Accumulated other comprehensive loss	(253)	(865)
Total stockholders’ equity	9,515	16,347
Total liabilities and stockholders’ equity	$ 63,534	$ 72,396