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Contract Assets and Contract Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue From Contract With Customer [Abstract] |
Summary of Company's Contract Asset and Contract Liability | Accounts receivable and unbilled, net consisted of the following (in thousands):
| As of |
| March 31, |  |  | January 1, |  |  |  |  |  |  | December 31, |
| 2018 |  |  | 2018 |  |  | Adjustments |  |  | 2017 |
Accounts receivable | $ | 67,616 |  |  | $ | 55,599 |  |  | $ | - |  |  | $ | 55,599 |
Unbilled receivables |  | 43,688 |  |  |  | 37,906 |  |  |  | 9,753 |  |  |  | 28,153 |
Less: allowance for doubtful accounts |  | (650 | ) |  |  | (673 | ) |  |  | - |  |  |  | (673 | )
Total accounts receivable and unbilled, net | $ | 110,654 |  |  | $ | 92,832 |  |  | $ | 9,753 |  |  | $ | 83,079 |
Advanced billings consisted of the following (in thousands):
| As of |
| March 31, |  |  | January 1, |  |  |  |  |  |  | December 31, |
| 2018 |  |  | 2018 |  |  | Adjustments |  |  | 2017 |
Advanced billings | $ | 126,387 |  |  | $ | 119,451 |  |  | $ | 45,695 |  |  | $ | 73,756 |
Pre-funded study costs | $ | - |  |  | $ | - |  |  | $ | (57,406 | ) |  | $ | 57,406 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045 + Details
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