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Stockholders' Equity and Stock-based Compensation - Schedule of Shares Outstanding and Exercisable (Details)	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Range of Exercise Prices, minimum	$ 1.47
Range of Exercise Prices, maximum	$ 42.80
Number of Options Outstanding | shares	2,525,005
Weighted Average Remaining Contractual Life in Years	5 years 9 months 14 days
Weighted Average Exercise Price	$ 5.10
Number Exercisable | shares	1,277,557
Weighted Average Exercisable Exercise Price	$ 5.12
Range One [Member]
Range of Exercise Prices, minimum	1.47
Range of Exercise Prices, maximum	$ 2.60
Number of Options Outstanding | shares	851,000
Weighted Average Remaining Contractual Life in Years	8 years 4 days
Weighted Average Exercise Price	$ 2.04
Number Exercisable | shares	367,921
Weighted Average Exercisable Exercise Price	$ 2.18
Range Two [Member]
Range of Exercise Prices, minimum	3.04
Range of Exercise Prices, maximum	$ 4.50
Number of Options Outstanding | shares	547,031
Weighted Average Remaining Contractual Life in Years	7 years 2 months 23 days
Weighted Average Exercise Price	$ 3.96
Number Exercisable | shares	392,138
Weighted Average Exercisable Exercise Price	$ 3.98
Range Three [Member]
Range of Exercise Prices, minimum	5.49
Range of Exercise Prices, maximum	$ 6.36
Number of Options Outstanding | shares	101,536
Weighted Average Remaining Contractual Life in Years	4 years 9 months 25 days
Weighted Average Exercise Price	$ 5.98
Number Exercisable | shares	99,658
Weighted Average Exercisable Exercise Price	$ 5.98
Range Four [Member]
Range of Exercise Prices, minimum	6.64
Range of Exercise Prices, maximum	$ 8.99
Number of Options Outstanding | shares	1,020,408
Weighted Average Remaining Contractual Life in Years	3 years 3 months 15 days
Weighted Average Exercise Price	$ 7.98
Number Exercisable | shares	412,810
Weighted Average Exercisable Exercise Price	$ 8.15
Range Five [Member]
Range of Exercise Prices, minimum	$ 42.80
Number of Options Outstanding | shares	5,030
Weighted Average Remaining Contractual Life in Years	1 year 10 months 14 days
Weighted Average Exercise Price	$ 42.80
Number Exercisable | shares	5,030
Weighted Average Exercisable Exercise Price	$ 42.80

X

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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X

- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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