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Commitments and Contingencies - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Operating lease, expiration year	2026-01
Restricted cash	$ 3,111,000	$ 2,475,000	$ 2,475,000	$ 2,375,000
Letter of Credit [Member] | Corporate Credit Card Program
Other Commitments [Line Items]
Restricted cash	2,000,000
Letter of Credit [Member] | Fleet Program
Other Commitments [Line Items]
Restricted cash	$ 700,000
Maximum
Other Commitments [Line Items]
Percentage of royalty payments obligation on net product sales	2.00%

X

- Definition

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+ References

No definition available.

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- Definition

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+ References

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- Definition

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+ References

No definition available.

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- Definition

Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 305
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84242212&loc=d3e2352-115587

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