Condensed Consolidated Statements of Cash Flows (Unaudited) Supplemental schedule of noncash financing activities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Jan. 27, 2014	Dec. 31, 2013
Derivative Liability		$ 10,080		$ 5,367		$ 14,420
Document Period End Date		Jun. 30, 2015
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Value		$ 1,141	$ 30
Curepet, Inc. [Member]
Purchase Price of Business Acquisition, Cost of Acquired Entity					$ 6,350
Derivative Liability		0			5,000
Noncash or Part Noncash Acquisition, Value of Assets Acquired					1,350
Curepet, Inc. [Member]
Purchase Price of Business Acquisition, Cost of Acquired Entity					6,350
Derivative Liability		$ 0			$ 5,000
Cost Method Investment, Ownership Percentage	19.80%
Payments to Acquire Other Investments	$ 2,000