Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 81,158,000	$ 114,229,000
Short-term investments	81,436,000	49,981,000
Accounts receivable, net	38,916,000	28,008,000
Inventories , net	19,499,000	10,597,000
Prepaid expenses and other current assets	7,141,000	2,808,000
Restricted cash	0	50,000
Total current assets	228,150,000	205,673,000
Property and equipment, net	14,748,000	7,498,000
Long-term investments	6,002,000	0
Operating lease right-of-use assets	42,855,000	0
Deposits and other assets	672,000	583,000
Restricted cash	0	338,000
Total assets	292,427,000	214,092,000
Current liabilities
Accounts payable	5,083,000	3,047,000
Payroll-related accruals	16,987,000	8,198,000
Accrued expenses and other current liabilities	6,583,000	2,593,000
Operating lease liabilities, current portion	857,000	0
Total current liabilities	29,510,000	13,838,000
Operating lease liabilities, noncurrent portion	28,547,000	0
Total liabilities	58,057,000	13,838,000
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized, no shares issued and outstanding as of June 30, 2021 and December 31, 2020	0	0
Common stock, $0.001 par value, 300,000,000 shares authorized as of June 30, 2021 and December 31, 2020; 49,828,829 and 49,251,614 shares issued and outstanding as of June 30, 2021 and December 31, 2020, respectively	50,000	49,000
Additional paid in capital	253,256,000	227,624,000
Accumulated other comprehensive (loss) income	(246,000)	4,000
Accumulated deficit	(18,690,000)	(27,423,000)
Total stockholders' equity	234,370,000	200,254,000
Total liabilities and stockholders' equity	$ 292,427,000	$ 214,092,000