Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net (loss) income	$ (404)	$ 1,170
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Change in allowance for doubtful accounts	73	37
Change in the fair value of acquisitions-related contingent consideration	(563)
Amortization of the fair value adjustment related to warranty liabilities acquired through acquisitions	(19)	(9)
Depreciation and amortization	1,799	1,258
Stock-based compensation	881	626
Foreign exchange losses	16	11
Amortization of premium on marketable securities		125
Increase in fair value of indemnification assets	(126)	(135)
Loss on settement agreement in connection with the indemnification assets	97
Deferred income taxes	63	63
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	891	(2,267)
Inventories	(34)	599
Prepaid expenses and other assets	(300)	(175)
Accounts payable and accrued liabilities	(2,169)	(1,892)
Deferred revenue	288	171
Other liabilities	146	66
Net cash provided by (used in) operating activities	639	(352)
Cash flows from investing activities, net of acquisition:
Acquisition of Euroscan, net of cash acquired of $280	(28,883)
Capital expenditures	(2,735)	(11,940)
Proceeds received from settlement agreement in connection with the indemnification assets	691
Purchases of marketable securities		(48,762)
Proceeds from maturities of marketable securities		19,910
Net cash used in investing activities	(30,927)	(40,792)
Cash flows from financing activities
Proceeds received from issuance of common stock in connection with public offering, net of underwriters' discounts and commissions and offering costs of $2,228	36,607
Proceeds received from issuance of $45,000 Senior Notes		45,000
Cash paid for debt issuance costs		(1,059)
Proceeds received from exercise of stock options	62	161
Principal payment of note payable		(3,450)
Principal payments of capital leases	(45)	(75)
Net cash provided by financing activities	36,624	40,577
Effect of exchange rate changes on cash and cash equivalents	(20)	(268)
Net increase (decrease) in cash and cash equivalents	6,316	(835)
Beginning of period	68,354	34,783
End of period	74,670	33,948
Cash paid for
Interest	1,069	1,033
Income taxes	101	787
Noncash investing and financing activities:
Capital expenditures incurred not yet paid	950	952
Stock-based compensation included in capital expenditures	61	25
Series A convertible preferred stock dividend paid in-kind	10	16
Issuance of common stock in connection with the acquisition of Euroscan	2,243
Common stock issued as form of payment for MPUs	213
Acquisition-related contingent consideration	4,800
Unpaid debt issuance costs included in accrued liabilities		$ 450