XML 57 R36.htm IDEA: XBRL DOCUMENT
v3.19.2

Composition of Certain Financial Statement Captions (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Composition Of Certain Financial Statement Captions [Abstract] |
Other Current Assets | As of December 31, 2018 and 2017, other current assets were comprised of the following (in thousands):
|  | December 31, |
|  | 2018 |  |  | 2017 |
Prepaid services, current |  | $ | 166 |  |  | $ | 121 |
Prepaid insurance |  |  | 564 |  |  |  | 556 |
Other receivables |  |  | 55 |  |  |  | 103 |
|  | $ | 785 |  |  | $ | 780 |
Property and Equipment, net | As of December 31, 2018 and 2017, property and equipment, net, were comprised of the following (in thousands):
|  | December 31, |
|  | 2018 |  |  | 2017 |
Office and computer equipment |  | $ | 1,279 |  |  | $ | 1,041 |
Leasehold improvements |  |  | 1,682 |  |  |  | 1,686 |
Property and equipment – gross |  |  | 2,961 |  |  |  | 2,727 |
Less accumulated depreciation |  |  | (662 | ) |  |  | (402 | )
Property and equipment – net |  | $ | 2,299 |  |  | $ | 2,325 |
Other Assets | As of December 31, 2018 and 2017, other assets were comprised of the following (in thousands):
|  | December 31, |
|  |  | 2018 |  |  |  | 2017 |
Deposits |  | $ | 39 |  |  | $ | 42 |
|  | $ | 39 |  |  | $ | 42 |
Accounts Payable and Accrued Expenses | As of December 31, 2018 and 2017, accounts payable and accrued expenses were comprised of the following (in thousands):
|  | December 31, |
|  | 2018 |  |  | 2017 |
Accrued expenses |  | $ | 824 |  |  | $ | 1,182 |
Accounts payable |  |  | 721 |  |  |  | 1,297 |
Accrued payroll and bonus |  |  | 423 |  |  |  | 750 |
Accrued legal fees |  |  | 186 |  |  |  | 509 |
Accrued vacation |  |  | 192 |  |  |  | 64 |
Accrued R&D studies |  |  | 230 |  |  |  | 285 |
Other current liabilities |  |  | 201 |  |  |  | 119 |
|  | $ | 2,777 |  |  | $ | 4,206 |

X
- Definition Composition of Certain Financial Statement Captions [Abstract] + References No definition available. + Details
Name: | pstv_CompositionOfCertainFinancialStatementCaptionsAbstract
Namespace Prefix: | pstv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_PropertyPlantAndEquipmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the carrying amounts of other assets. This disclosure includes other current assets and other noncurrent assets. + References No definition available. + Details
Name: | us-gaap_ScheduleOfOtherAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the carrying amounts of other current assets. + References No definition available. + Details
Name: | us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration