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Composition of Certain Financial Statement Captions - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property and Equipment, net [Abstract]
Office and computer equipment	$ 1,474	$ 1,231
Leasehold improvements	1,810	1,661
Property and equipment, gross	3,284	2,892
Less accumulated depreciation	(1,960)	(1,415)
Property and equipment, net	$ 1,324	$ 1,477

X

- Definition

The gross amount of office and computer equipment cost as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	pstv_
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Period Type:	instant

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-Publisher FASB
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-Subparagraph (SX 210.5-02(14))
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X

- Definition

Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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X

- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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- References

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