CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 55,704	$ 26,889
Short term investments	25,086	42,829
Accounts receivable (net of allowance for doubtful accounts of $207 and $306, respectively)	23,655	32,168
Inventory	8,417	6,816
Other current assets	2,900	2,953
Total current assets	115,762	111,655
Property and equipment, net	7,040	7,144
Restricted cash	89	89
Right-of-use leased assets	23,800	25,103
Long term investments	0	9,247
Total assets	146,691	153,238
Current liabilities:
Accounts payable	4,535	6,345
Accrued expenses	7,975	7,948
Current portion of operating lease liabilities	5,570	5,461
Other liabilities	41	41
Total current liabilities	18,121	19,795
Operating lease liabilities	20,881	22,242
Other long-term liabilities	93	110
Total liabilities	39,095	42,147
COMMITMENTS AND CONTINGENCIES
Shareholders’ equity:
Common stock, no par value; shares authorized — 75,000; shares issued and outstanding — 45,194 and 44,864, respectively	499,103	489,749
Other comprehensive gain	146	21
Accumulated deficit	(391,653)	(378,679)
Total shareholders’ equity	107,596	111,091
Total liabilities and shareholders’ equity	$ 146,691	$ 153,238