CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 45,623	$ 26,889
Short term investments	35,957	42,829
Accounts receivable (net of allowance for doubtful accounts of $223 and $306, respectively)	24,171	32,168
Inventory	7,282	6,816
Other current assets	3,504	2,953
Total current assets	116,537	111,655
Property and equipment, net	7,423	7,144
Restricted cash	89	89
Right-of-use assets	24,496	25,103
Long term investments	1,720	9,247
Total assets	150,265	153,238
Current liabilities:
Accounts payable	6,400	6,345
Accrued expenses	6,149	7,948
Current portion of operating lease liabilities	5,535	5,461
Other liabilities	41	41
Total current liabilities	18,125	19,795
Operating lease liabilities	21,597	22,242
Other long-term liabilities	91	110
Total liabilities	39,813	42,147
COMMITMENTS AND CONTINGENCIES
Shareholders’ equity:
Common stock, no par value; shares authorized — 75,000; shares issued and outstanding — 44,963 and 44,864, respectively	493,774	489,749
Other comprehensive gain	62	21
Accumulated deficit	(383,384)	(378,679)
Total shareholders’ equity	110,452	111,091
Total liabilities and shareholders’ equity	$ 150,265	$ 153,238