CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 58,154	$ 33,620
Short-term investments	25,402	42,187
Accounts receivable (net of allowance for doubtful accounts of $121 and $143, respectively)	29,122	34,504
Inventory	10,322	9,356
Other current assets	4,213	3,893
Total current assets	127,213	123,560
Property and equipment, net	9,076	7,633
Restricted cash	211	211
Right-of-use assets	48,943	50,105
Long-term investments	26,021	24,099
Total assets	211,464	205,608
Current liabilities:
Accounts payable	8,826	6,755
Accrued expenses	9,965	11,293
Current portion of operating lease liabilities	4,398	4,394
Other liabilities	41	41
Total current liabilities	23,230	22,483
Operating lease liabilities	47,968	48,789
Other long-term liabilities	57	76
Total liabilities	71,255	71,348
COMMITMENTS AND CONTINGENCIES
Shareholders’ equity:
Common stock, no par value; shares authorized — 75,000; shares issued and outstanding — 46,225 and 45,804, respectively	519,360	510,061
Accumulated other comprehensive income (loss)	(47)	14
Accumulated deficit	(379,104)	(375,815)
Total shareholders’ equity	140,209	134,260
Total liabilities and shareholders’ equity	$ 211,464	$ 205,608