Accounts Receivable (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Allowance for doubtful accounts | $ 21,000 | $ 24,000 | |
| Bad debt expense | 0 | 1,424,000 | $ 0 |
| Selling, General and Administrative Expenses | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Bad debt expense | $ 0 | $ 1,400,000 | $ 0 |