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Cash and Cash Equivalents (Details)
Dec. 31, 2016
lender
Dec. 31, 2015
USD ($)
Mar. 31, 2013
USD ($)
Cash and Cash Equivalents      
Number of lenders | lender 2    
2013 Loan and Security Agreement | Revolving Credit Facility      
Cash and Cash Equivalents      
Covenant terms, minimum required cash on deposit at lender | $   $ 7,500,000.0 $ 7,500,000.0