Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net loss	$ (3,698,000)	$ (3,665,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,213,000	1,235,000
Stock-based compensation	3,753,000	4,327,000
Change in fair value of contingent consideration related to acquisition	(8,028,000)	(2,400,000)
Accretion of interest on convertible note	1,622,000	0
Amortization of deferred financing costs	198,000	0
Non-cash foreign exchange gain	212,000	0
Changes in operating assets and liabilities:
Accounts receivable and other receivables	(2,108,000)	(5,717,000)
Inventories	(8,793,000)	647,000
Prepaid expenses and other current assets	(1,283,000)	(454,000)
Accounts payable	3,855,000	336,000
Accrued payroll	1,224,000	683,000
Accrued expenses and other liabilities	2,097,000	3,319,000
Net cash used in operating activities	(10,160,000)	(1,689,000)
Cash flows from investing activities:
Purchases of marketable securities	(74,114,000)	0
Maturities of marketable securities	25,585,000	0
Net cash used in investing activities	(5,743,000)	(1,373,000)
Cash flows from financing activities:	(54,272,000)	(1,373,000)
Cash flows from financing activities:
Proceeds from sale of common stock under employee stock purchase plan	1,446,000	1,646,000
Proceeds from exercise of stock options	1,094,000	1,328,000
Funding of restricted cash account	0	(5,395,000)
Minimum tax withholding paid on behalf of employees for restricted stock units	(1,395,000)	0
Net cash provided by (used in) financing activities	1,145,000	(2,421,000)
Net cash provided by (used in) financing activities	(22,000)	172,000
Effect of exchange rate changes on cash and cash equivalents	(63,309,000)	(5,311,000)
Cash and cash equivalents, beginning of period	95,152,000	45,118,000
Cash and cash equivalents, end of period	31,843,000	39,807,000
Supplemental disclosure of cash flow information:
Cash paid for interest	1,045,000	0
Cash paid for income taxes	207,000	0
Non-cash investing and financing activities:
Landlord funded leasehold improvements	3,870	0
Fair value of OUS Milestone Shares (note 9)	38,372	0
Acquisition of property and equipment included in accounts payable	$ 1,403	$ 0