CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 93,828	$ 113,683
Accounts receivable, net	13,659	23,488
Inventories	26,935	19,873
Prepaid expenses and other current assets	6,485	5,041
Total current assets	140,907	162,085
Property and equipment, net	21,667	20,573
Operating lease right-of-use assets	7,835	8,260
Restricted cash	253	1,853
Goodwill	14,009	16,226
Intangible assets, net	5,201	5,694
Other long-term assets	1,166	967
Total assets	191,038	215,658
Current liabilities
Accounts payable	6,049	4,967
Contract liabilities	1,285	2,977
Accrued expenses and other current liabilities	19,535	34,033
Revolving loan facility, current portion	1,158
Total current liabilities	28,027	41,977
Long-term loans payable, net	39,671	39,653
Revolving loan facility, net of current portion	3,731	4,888
Deferred income tax liabilities	9	6
Other long-term liabilities	12,598	15,229
Total liabilities	84,036	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 March 31, 2021 and December 31, 2020
Common stock ($0.001 par value) 175,000,000 shares authorized as of March 31, 2021 and December 31, 2020, 25,834,208 and 25,722,984 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	26	26
Additional paid-in capital	434,274	430,781
Accumulated other comprehensive income	52	41
Accumulated deficit	(327,350)	(316,943)
Total stockholders' equity	107,002	113,905
Total liabilities and stockholders’ equity	$ 191,038	$ 215,658