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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of financial assets and liabilities at fair value on a recurring basis
The Company measures the following financial assets at fair value on a recurring basis. There were no transfers between levels of the fair value hierarchy during any of the periods presented. The following tables set forth the Company’s financial assets carried at fair value categorized using the lowest level of input applicable to each financial instrument as of March 31, 2017 and December 31, 2016 (in thousands):
 
 
 
Balance at December 31, 2017
 
Quoted Prices in Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
 
Cash
 
$
6,702

 
$
6,702

 
$
—

 
$
—

Money market funds
 
52,120

 
52,120

 
—

 
—

Restricted cash
 
260

 
260

 
—

 
—

Total
 
$
59,082

 
$
59,082

 
$
—

 
$
—

 
 
 
Balance at December 31, 2016
 
Quoted Prices in Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
 
Cash
 
$
16,887

 
$
16,887

 
$
—

 
$
—

Money market funds
 
56,601

 
56,601

 
—

 
—

Restricted cash
 
260

 
260

 
—

 
—

Total
 
$
73,748

 
$
73,748

 
$
—

 
$
—