CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 36,905	$ 18,286
Short-term investments	37,760	64,638
Accounts receivable (net of allowance for doubtful accounts of $643 and $514, respectively)	19,958	23,454
Inventory	6,823	3,558
Other current assets	3,272	2,847
Total current assets	104,718	112,783
Property and equipment, net	7,190	5,906
Right-of-use assets	25,619	0
Total assets	137,527	118,689
Current liabilities:
Accounts payable	5,281	7,108
Accrued expenses	6,960	6,930
Current portion of operating lease liabilities	2,836	0
Other liabilities	35	754
Total current liabilities	15,112	14,792
Operating lease liabilities	25,311	0
Other long-term liabilities	114	1,666
Total liabilities	40,537	16,458
COMMITMENTS AND CONTINGENCIES
Shareholders’ equity:
Common stock, no par value; shares authorized — 75,000; shares issued and outstanding — 44,520 and 43,578, respectively	485,141	471,180
Other comprehensive gain (loss)	29	(39)
Warrants	0	104
Accumulated deficit	(388,180)	(369,014)
Total shareholders’ equity	96,990	102,231
Total liabilities and shareholders’ equity	$ 137,527	$ 118,689

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).