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Restructuring - Additional Information (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 | Mar. 31, 2016 USD ($) Position | Dec. 31, 2018 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Total termination charges |  |  |  | $ 676,000 |
Severance benefits and other one-time termination costs |  |  |  | 600,000 |
Cash expenditures |  |  |  | $ 600,000 |
Reduction in workforce, as a percent |  |  | 60.00% |  |
Restructuring expense |  | $ 50,000 |  |  | $ 1,000,000
Termination fee | $ 270,000 |  |  |  |
United States |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Number of positions/employees terminated | Position |  |  |  | 12 |
Hyderabad India |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Number of positions/employees terminated | Position |  |  |  | 18 |

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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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