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Prepaids and Other Current Assets - Summary of Prepaids and Other Current Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Prepaid Expense And Other Assets Current [Abstract]    
Offering costs   $ 4,397us-gaap_DeferredOfferingCosts
Prepaid insurance 1,280us-gaap_PrepaidInsurance 249us-gaap_PrepaidInsurance
Other 300us-gaap_OtherPrepaidExpenseCurrent 251us-gaap_OtherPrepaidExpenseCurrent
Total prepaids and other current assets $ 1,580us-gaap_PrepaidExpenseCurrent $ 4,897us-gaap_PrepaidExpenseCurrent