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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2017
Summary of Significant Accounting Policies [Abstract]  
Schedule of Cash and Equivalents
Cash and cash equivalents consist of highly liquid investments with maturities of three months or less from the date of purchase. Cash and cash equivalents consist of the following at (in thousands):
 
 
 
June 30,
 
 
December 31,
 
 
 
2017
 
 
2016
 
Cash
 
$
17,266
 
 
$
17,481
 
Money market funds
 
 
41,527
 
 
 
95,896
 
Government-backed securities
 
 
17,000
 
 
 
19,000
 
Corporate debt securities
 
 
—
 
 
 
11,976
 
Cash and cash equivalents
 
$
75,793
 
 
$
144,353