Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current deferred tax assets:
Inventory reserves	$ 71	$ 41
Accrued expenses	331	77
Deferred Rent	14	30
Allowance for uncollectible accounts receivable	12	18
Valuation allowance	(428)	(166)
Net current deferred tax asset	0	0
Noncurrent deferred tax assets:
Stock-based compensation	1,170	186
Contribution carryforward	2	0
Research credit carryforward	2,307	874
Fixed assets	235	141
Capitalized start up costs	4,676	2,180
Net operating loss carryforwards	38,286	22,820
Deferred Tax Assets, Gross	46,676	26,201
Valuation allowance	(46,672)	(26,201)
Net noncurrent deferred tax asset	4	0
Noncurrent deferred tax liability
Purchase accounting intangibles	(4)	0
Net deferred tax asset (liability)	$ 0	$ 0