CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 70,335	$ 113,683
Accounts receivable, net	20,812	23,488
Inventories	24,730	19,873
Prepaid expenses and other current assets	5,924	5,041
Total current assets	121,801	162,085
Property and equipment, net	21,727	20,573
Operating lease right-of-use assets	6,956	8,260
Restricted cash	253	1,853
Goodwill	13,996	16,226
Intangible assets, net	4,877	5,694
Other long-term assets	1,201	967
Total assets	170,811	215,658
Current liabilities
Accounts payable	4,143	4,967
Contract liabilities	2,190	2,977
Accrued expenses and other current liabilities	28,830	34,033
Total current liabilities	35,163	41,977
Long-term loans payable, net	39,707	39,653
Revolving loan facility	1,726	4,888
Deferred income tax liabilities	8	6
Other long-term liabilities	11,978	15,229
Total liabilities	88,582	101,753
Commitments and contingencies (Note 9)
Stockholders' equity
Preferred stock ($0.001 par value) 25,000,000 shares authorized; no shares issued and outstanding as of September 30, 2021 and December 31, 2020
Common stock ($0.001 par value) 175,000,000 shares authorized as of September 30, 2021 and December 31, 2020, 26,043,578 and 25,722,984 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	26	26
Additional paid-in capital	440,367	430,781
Accumulated other comprehensive income	19	41
Accumulated deficit	(358,183)	(316,943)
Total stockholders' equity	82,229	113,905
Total liabilities and stockholders’ equity	$ 170,811	$ 215,658