Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 21,229	$ 21,809
Short-term investments	14,809	12,642
Accounts receivable, less allowance for doubtful accounts of $32 and $32	22,325	23,083
Inventories	22,571	22,451
Other current assets	3,835	2,273
Total current assets	84,769	82,258
Property and equipment, net	28,549	28,749
Intangible assets, net	50,422	50,764
Goodwill	105,257	105,257
Other noncurrent assets	705	676
Total Assets	269,702	267,704
Current liabilities:
Accounts payable	11,583	12,431
Accrued liabilities	14,714	18,911
Other current liabilities and current maturities of capital leases	575	561
Total current liabilities	26,872	31,903
Capital leases	12,626	12,761
Long-term debt	39,313	24,100
Other noncurrent liabilities	37,768	37,774
Total Liabilities	116,579	106,538
Commitments and contingencies (Note 10)
Stockholders' Equity:
Common stock, $0.001 par value, 90,000 shares authorized and 35,039 and 34,586 issued and outstanding	35	35
Additional paid-in capital	388,976	386,963
Accumulated other comprehensive income	112	34
Accumulated deficit	(236,000)	(225,866)
Total Stockholders' Equity	153,123	161,166
Total Liabilities and Stockholders' Equity	$ 269,702	$ 267,704

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).

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

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.