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Significant Accounting Policies - Concentration of Credit Risk (Details) - Institution	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Number of financial institutions where substantially all of the cash is maintained	1
Accounts Receivable | Credit Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)	31.00%	48.00%
Accounts Receivable | Credit Concentration Risk | Largest customer
Concentration Risk [Line Items]
Concentration risk (as a percent)	16.00%	25.00%
Accounts Receivable | Credit Concentration Risk | Second largest customer
Concentration Risk [Line Items]
Concentration risk (as a percent)	15.00%	13.00%
Accounts Receivable | Credit Concentration Risk | Third largest customer
Concentration Risk [Line Items]
Concentration risk (as a percent)		10.00%

X

- Definition

Concentration Risk, Credit Risk, Substantially All Cash, Financial Institutions, Number

+ References

No definition available.

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- 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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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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