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Common Stock - Additional Information (Detail) - USD ($) |  | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 14, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock, shares authorized |  | 75,000,000 | 75,000,000 | 75,000,000
Common stock, par value |  | $ 0.001 | $ 0.001 | $ 0.001
Preferred stock, shares authorized |  | 5,000,000 | 5,000,000 |
Preferred stock, par value |  | $ 0.001 | $ 0.001 |
Common stock, shares issued |  | 11,956,752 | 11,956,752 | 21,230
Gross proceeds |  |  | $ 64,000 |
Stock option exercises, Shares |  |  | 0 | 0
Restricted stock unit settlements |  |  | 5,464 | 0
Common shares reserved for options currently outstanding |  | 1,115,647 | 1,115,647 |
Number of warrants exercised |  |  | 0 |
Restricted Stock Unit [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 4 years |
Common shares reserved for awards currently outstanding |  | 210,160 | 210,160 |
2017 Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration period |  |  | 10 years |
2017 Equity Incentive Plan [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for issuance under incentive plan |  | 1,052,200 | 1,052,200 |
2010 Performance Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration period |  |  | 10 years |
2010 Performance Incentive Plan [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for issuance under incentive plan |  | 68,507 | 68,507 |
Common shares reserved for options currently outstanding |  | 63,447 | 63,447 |
2010 Performance Incentive Plan [Member] | Restricted Stock Unit [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for awards currently outstanding |  | 5,060 | 5,060 |
Minimum [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration period |  |  | 7 years |
Minimum [Member] | Stock Options [Member] | Employees and Consultants [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
Minimum [Member] | Stock Options [Member] | Board of Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 1 year |
Minimum [Member] | 2017 Equity Incentive Plan [Member] | Employees and Consultants [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
Minimum [Member] | 2017 Equity Incentive Plan [Member] | Board of Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 1 year |
Minimum [Member] | 2010 Performance Incentive Plan [Member] | Employees and Consultants [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
Minimum [Member] | 2010 Performance Incentive Plan [Member] | Board of Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 1 year |
Maximum [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration period |  |  | 10 years |
Maximum [Member] | Stock Options [Member] | Employees and Consultants [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 4 years |
Maximum [Member] | Stock Options [Member] | Board of Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
Maximum [Member] | 2017 Equity Incentive Plan [Member] | Employees and Consultants [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 4 years |
Maximum [Member] | 2017 Equity Incentive Plan [Member] | Board of Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
Maximum [Member] | 2010 Performance Incentive Plan [Member] | Employees and Consultants [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 4 years |
Maximum [Member] | 2010 Performance Incentive Plan [Member] | Board of Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
LPC [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock, par value | $ 0.001 |  |  |
Common stock value right to sell, maximum | $ 11,000,000 |  |  |
Initial purchase of common stock |  | 328,947 |  |
Common stock, purchase price | $ 1.00 |  |  |
Additional common stock value right to sell, maximum | $ 10,000,000 |  |  |
Additional purchase of common stock, maximum | 80,000 |  |  |
Common stock, shares issued | 123,516 | 873,778 | 873,778 |
Gross proceeds | $ 0 |  |  |
Gross proceeds |  | $ 2,000,000 |  |
Offering expenses |  | 100,000 |  |
Common stock available for sale under offering |  | $ 9,000,000 | $ 9,000,000 |
LPC [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock, purchase price | $ 2.00 |  |  |
LPC [Member] | Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Initial purchase of common stock | 328,947 |  |  |
Common stock, purchase price | $ 3.04 |  |  |
Purchase agreement, description |  |  | Unit consisting of (a) one share of our Common Stock and (b) one warrant to purchase one-quarter of a share of Common Stock at an exercise price of $3.496 per share, or Warrant. Each Warrant is exercisable six months following the issuance date until the date that is five years and six months after the issuance date and is subject to customary adjustments. |
Exercise price per unit of warrant | $ 3.496 |  |  |
Initial purchase of units consisting of common stock and warrants issued | $ 1,000,000 |  |  |
Number of warrants issued | 0 |  |  |
LPC [Member] | Other Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of warrants issued | 0 |  |  |

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