CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 13,962	$ 18,286
Short-term investments	52,047	64,638
Accounts receivable (net of allowance for doubtful accounts of $748 and $514, respectively)	21,084	23,454
Inventory	4,788	3,558
Other current assets	2,167	2,847
Total current assets	94,048	112,783
Property and equipment, net	6,963	5,906
Right-of-use assets	24,815	0
Total assets	125,826	118,689
Current liabilities:
Accounts payable	5,250	7,108
Accrued expenses	4,701	6,930
Current portion of operating lease liabilities	2,558	0
Other liabilities	34	754
Total current liabilities	12,543	14,792
Operating lease liabilities	24,607	0
Other long-term liabilities	134	1,666
Total liabilities	37,284	16,458
COMMITMENTS AND CONTINGENCIES
Shareholders’ equity:
Common stock, no par value; shares authorized — 75,000; shares issued and outstanding — 44,066 and 43,578, respectively	480,050	471,180
Other comprehensive gain (loss)	38	(39)
Warrants	104	104
Accumulated deficit	(391,650)	(369,014)
Total shareholders’ equity	88,542	102,231
Total liabilities and shareholders’ equity	$ 125,826	$ 118,689