Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Operating loss and credit carryforwards	$ 2,543	$ 514
Capitalized research and development	1,612	0
Stock-based compensation	1,086	294
Accrued expenses	27	0
Property, plant and equipment	9	0
Total deferred tax assets	5,277us-gaap_DeferredTaxAssetsGross	808us-gaap_DeferredTaxAssetsGross
Less: valuation allowance	(5,277)	(808)
Deferred tax assets, net	$ 0us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 0us-gaap_DeferredTaxAssetsLiabilitiesNet

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