CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 26,889	$ 18,286
Short term investments	42,829	64,638
Accounts receivable (net of allowance for doubtful accounts of $306 and $514, respectively)	32,168	23,454
Inventory	6,816	3,558
Other current assets	2,953	2,847
Total current assets	111,655	112,783
Property and equipment, net	7,144
Property and equipment, net		5,906
Restricted cash	89	0
Right-of-use assets	25,103
Long term investments	9,247	0
Total assets	153,238	118,689
Current liabilities:
Accounts payable	6,345	7,108
Accrued expenses	7,948	6,930
Current portion of operating lease liabilities	5,461
Other liabilities	41	754
Total current liabilities	19,795	14,792
Operating lease liabilities	22,242
Other long-term liabilities	110	1,666
Total liabilities	42,147	16,458
COMMITMENTS AND CONTINGENCIES
Shareholders’ equity:
Common stock, no par value; shares authorized — 75,000; shares issued and outstanding — 44,864 and 43,578, respectively	489,749	471,180
Other comprehensive gain (loss)	21	(39)
Warrants	0	104
Accumulated deficit	(378,679)	(369,014)
Total shareholders’ equity	111,091	102,231
Total liabilities and shareholders’ equity	$ 153,238	$ 118,689