Stock-Based Compensation - Schedule of Total Stock-Based Compensation Expense Related to Share-Based Awards Under the Pieris Plan (Detail) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
| Total stock-based compensation expense | $ 559,878 | $ 611,845 | $ 1,312,070 | $ 980,229 |
| Research and Development [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
| Total stock-based compensation expense | 190,819 | 175,498 | 357,430 | 301,939 |
| General and Administrative [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
| Total stock-based compensation expense | $ 369,059 | $ 436,347 | $ 954,640 | $ 678,290 |