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Revenue from Contract with Customers - Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 1,700	$ 1,300
ASUS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Receivable from the U.S. government	59,859	59,859	$ 61,126
Contract assets	31,557	31,557	24,447
Contract liabilities	$ 11,564	$ 11,564	$ 7,530

X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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X

- Definition

The amount of receivables that are derived from government contracts.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 310
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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