Acquisition of HyPulsion (Details) $ in Thousands		3 Months Ended	9 Months Ended
	Jul. 31, 2015 USD ($) shares	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Aug. 26, 2015 USD ($)	Dec. 31, 2014 USD ($)
Business Combination, Goodwill [Abstract]
Total goodwill recognized		$ 399	$ 399			$ 447
(Loss) gain on acquisition activity, net		$ (116)	$ (116)	$ 1,014
HyPulsion
Preliminary allocation of the purchase price to the estimated fair value of the net assets acquired
Total Net Assets Acquired, excluding goodwill	$ (6,230)
Business Combination, Goodwill [Abstract]
Consideration paid	11,474
Fair value of prior interest	2,869
Net assets acquired	(6,230)
Total goodwill recognized	$ 8,113
Percentage of investment recognized as gain	0.2
(Loss) gain on acquisition activity, net	$ 2,900
Axane, S.A. | HyPulsion
Business Acquisition [Line Items]
Percentage of voting interest acquired	80.00%
Value of shares of common stock issued	$ 11,500				$ 3,000
Number of shares of common stock issued | shares	4,781,250
Additional shares issuable in certain circumstances | shares	1,613,289
Preliminary allocation of the purchase price to the estimated fair value of the net assets acquired
Cash and cash equivalents	$ 1,811
Accounts receivable, net	917
Inventory	475
Prepaid expenses and other assets	746
Property and equipment	767
Identifiable intangibles	4,159
Accounts payable, accrued expenses, deferred revenue and other liabilities	(2,645)
Total Net Assets Acquired, excluding goodwill	6,230
Business Combination, Goodwill [Abstract]
Net assets acquired	$ 6,230