CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 54,553	$ 33,620
Short-term investments	43,738	42,187
Accounts receivable (net of allowance for doubtful accounts of $40 and $143, respectively)	28,910	34,504
Inventory	13,059	9,356
Other current assets	4,686	3,893
Total current assets	144,946	123,560
Property and equipment, net	11,819	7,633
Restricted cash	211	211
Right-of-use assets	46,713	50,105
Long-term investments	20,235	24,099
Other long-term assets	219	0
Total assets	224,143	205,608
Current liabilities:
Accounts payable	5,575	6,755
Accrued expenses	10,932	11,293
Current portion of operating lease liabilities	2,280	4,394
Other liabilities	41	41
Total current liabilities	18,828	22,483
Operating lease liabilities	48,493	48,789
Other long-term liabilities	42	76
Total liabilities	67,363	71,348
COMMITMENTS AND CONTINGENCIES
Shareholders’ equity:
Common stock, no par value; shares authorized — 75,000; shares issued and outstanding 46,767 and 45,804, respectively	544,624	510,061
Accumulated other comprehensive income (loss)	(23)	14
Accumulated deficit	(387,821)	(375,815)
Total shareholders’ equity	156,780	134,260
Total liabilities and shareholders’ equity	$ 224,143	$ 205,608