CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 43,507	$ 26,889
Short-term investments	42,035	42,829
Accounts receivable (net of allowance for doubtful accounts of $187 and $306, respectively)	26,174	32,168
Inventory	10,080	6,816
Other current assets	3,586	2,953
Total current assets	125,382	111,655
Property and equipment, net	7,115	7,144
Restricted cash	211	89
Right-of-use leased assets	24,796	25,103
Long-term investments	0	9,247
Total assets	157,504	153,238
Current liabilities:
Accounts payable	6,475	6,345
Accrued expenses	8,695	7,948
Current portion of operating lease liabilities	6,102	5,461
Other liabilities	41	41
Total current liabilities	21,313	19,795
Operating lease liabilities	21,487	22,242
Other long-term liabilities	74	110
Total liabilities	42,874	42,147
COMMITMENTS AND CONTINGENCIES
Shareholders’ equity:
Common stock, no par value; shares authorized — 75,000; shares issued and outstanding — 45,315 and 44,864, respectively	502,587	489,749
Other comprehensive gain	78	21
Accumulated deficit	(388,035)	(378,679)
Total shareholders’ equity	114,630	111,091
Total liabilities and shareholders’ equity	157,504	153,238
Allowance for doubtful accounts	$ 187	$ 306
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	45,315,000	44,864,000
Common stock, shares outstanding (in shares)	45,315,000	44,864,000