Description of the Business - Additional Information (Detail)
$ / shares in Units, $ in Thousands |
|
1 Months Ended |
9 Months Ended |
12 Months Ended |
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Oct. 29, 2014
USD ($)
shares
|
Jun. 30, 2016
shares
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Sep. 30, 2016
USD ($)
|
Dec. 31, 2014
USD ($)
$ / shares
shares
|
Dec. 31, 2015
USD ($)
|
Sep. 30, 2015
USD ($)
|
| Organization [Line Items] |
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| Reverse stock split of common stock |
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1-for-12
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| Reverse stock split ratio |
0.0833
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| Purchase price of PPI common stock shares, prior to merger |
$ 93,000
|
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| Common stock issued on public offering | shares |
8,068,766
|
4,887,500
|
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| Exchange rate of common stock shares |
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0.0675
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| Accumulated deficit |
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$ (353,909)
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$ (268,726)
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| Cash, cash equivalents and available for sale marketable securities current |
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120,800
|
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| Hercules Term Loan [Member] |
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| Organization [Line Items] |
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| Principal amount outstanding |
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$ 40,000
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| Remaining available amount under loan agreement |
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$ 20,000
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$ 20,000
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| Old Paratek Stockholders [Member] |
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| Organization [Line Items] |
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| Percentage of ownership on fully diluted common stock |
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89.60%
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| Former Transcept Stockholders [Member] |
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| Organization [Line Items] |
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| Percentage of ownership on fully diluted common stock |
|
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10.40%
|
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| 2014 Notes [Member] |
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| Organization [Line Items] |
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| Number of shares of common stock converted | shares |
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1,335,632
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| Common stock conversion price | $ / shares |
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$ 0.778
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| Principal amount outstanding |
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$ 6,000
|
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