Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 21,809	$ 24,208
Short-term investments	12,642	19,801
Accounts receivable, less allowance for doubtful accounts of $32 and $246	23,083	21,094
Inventories	22,451	17,660
Other current assets	2,273	2,954
Total current assets	82,258	85,717
Property and equipment, net	28,749	29,995
Long-term investments		3,000
Intangible assets, net	50,764	52,131
Goodwill	105,257	105,257
Other noncurrent assets	676	321
Total Assets	267,704	276,421
Current liabilities:
Accounts payable	12,431	10,673
Accrued liabilities	18,911	16,467
Other current liabilities and current maturities of capital leases and long-term debt	561	1,688
Total current liabilities	31,903	28,828
Capital leases	12,761	13,319
Long-term debt	24,100	23,886
Other noncurrent liabilities	37,774	41,946
Total Liabilities	106,538	107,979
Commitments and contingencies (Note 10)
Stockholders' Equity:
Common stock, $0.001 par value, 90,000 shares authorized and 34,586 and 33,342 issued and outstanding	35	33
Additional paid-in capital	386,963	367,851
Accumulated other comprehensive income (loss)	34	(468)
Accumulated deficit	(225,866)	(198,974)
Total Stockholders' Equity	161,166	168,442
Total Liabilities and Stockholders' Equity	$ 267,704	$ 276,421

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.